Summary

This PR adds a new quectel port with support for quectel product; https://developer.quectel.com/en/

Supported features of this port:

• REPL (Python prompt) over usb.
• filesystem.
• The machine module with GPIO, UART, SPI, ADC, WDT and Timer.
• The network module with 4G modem support.

Supported boards:

• Covers most of Quectel cellular modules.

General notes about the port:

• it uses make, similar to other ports here.
• the toolchain is the standard arm-none-eabi- toolchain.
• This has been adapted for use since version 1.13, and may have accumulated some differences from the latest version.
• new featue celluar network.

Testing

Extensive testing has been done during development over the past several years.